This universal mechanical cooling 1" aluminum fan spacer is a must-have for any car or truck owner looking to upgrade their engine cooling components. Designed to fit 5/8" pilot sizes, this spacer is compatible with GM Ford and Mopar. In addition, this fan spacer is subject to California Prop 65 Warning, which can be found at https://www.p65warnings.ca.gov/ for more information. Whether you're in need of a replacement or simply want to improve your engine's cooling efficiency, this fan spacer is the perfect choice.